Machine for coating blanks with paraffin



FIP. VAI/RA. MACHINE FOR GOATIG BLANKS WITH PARAFFIN.

APPLICATION FILED AUG.9, |918. REIIEWED NOV. 1.1919.

I1 ,327 ,300. I Patented Jan, 6, 1920.

3 SHEETS-SHEET I.

n F. P. vAvRA. MACHINE FOR CATING BLANKS WITH FARAFFIN. APPLICATION FILED AUG.9 1918. RENEWED NOV. 1| 1919.

1,327,300. 'Patented Jan. 6,1920.

3 SHEETS-SHEET 2.

F. P. VAVRA.

MACHINE FOR COATING BLANKS'WITH PARAFFIN. APPLICATION FILED AuG.9. 1918. BENI-:WED Nov. 1, 1919.

` '1,327,300 Batented'Jan.6,1920;

3 SHEETS-SHEET 3- FRANK P. vAvnA, or creano, ILLINOIS.

MAGHINEFOR COAIING' BLANES' WITH PARAFFIN.

l Specication of Letters Patent.

Patented Jan. c, 1920.

Application led August 9, 1918, Serial No. 249,157. Renewed November 1, 1919. Serial No. '335,111.'

To all 'whom it may concern:

Be it known that I, FRANK P. VAVRA, a citizen of the United States, and a resident of Cicero, vin the county of Cook and State of Illinois, have invented certain new and useful Improvements in Machines for Coating Blanks with Paraiin, of which the following is a full, clear, and exact specification.v

My invention is concerned with machines for coating blanks with paraffin of the general class shown in the Vavra Patent No.

1,198,976, and has for its object the elimination of the tank heretofore' employed in which one .or more of the gaging rolls rotates, and the supplying accurately of the necessary amount of'paraiiin to effect the coating through the axes of the gaging rolls, which to this end are hollow, and have perforations in the peripheries through which the necessaryamount of paraffin is forced either by centrifugal action orhydrostatic Fig. 2 is a horizontal section on the linev 2 2 of Fig. 1; and

Fig. 3 is a vertical section on the line 3 3 of Fig. 2.

. The machine is preferably provided with a suitable cast iron frame 10, within which Iwill be lseated or supported a customary -co'oling water tank 11, which will be pro-` vided with'the customary rolls 12 and 13,

and the'endless strings 14 and 15, and other suitable rollscoperating with the strlngs so that the hot coated car ons dropped down into the receiving angle of the strings between the rolls 12 and 13 will be carried through the cold water to chill and set thel paraffin on the surface of the blanks or car. tons in the customary manner. The use of` this cooling water tank is old and perse,

forms no part of mypresent invention.

Above the receiving angle between the rolls 12 and 13, I journal in the frame 1 0, the

pair of gaging rolls 16 and 17, which are preferably provided `at-'one end with the' solid axles 18 and 19 journaled insuitable bearings in the. framework 10, as will be subsequently described, and having on their ends the intermeshing spur gear wheels 20 muon.

and'21, the shaft or axle 19 Ibein extended and carrying at its outer end the elt wheel 22 by which the machine is driven, and, where an lautomatic feed is provided, also carrying the -spur gear wheel 23 which meshes with the spur gear wheel 24 secured on the shaft 25 of the rubber faced feed roller 26 which coperates with the carton blanks 27 piled on the feed board 28 in the customary manner. The cartons are directed tothe receiving angle of the gagingrolls 16 and 17 by two sets of guide wires 29 and 30, the wires 29 being conveniently hooked upon thespacing. rod 31 extending across the top of the machine between the lframemembers, while the wires are secured to the bottom of the feed board28.

The bodies of the gaging rolls 16 and 17 are formed of the hollow metallic cylinders 32 which are provided with numerous perforations 33 inthe surfacethereof, and surrounding the metallic cylinder is the'layer 34 of felt, or some other suitable'fibrous material, of a thickness of say a quarter of an inch or more, which felt becomes saturated with the melted paraffin escaping fromthe hollow interior of the gaging rolls 16 and 17 4through the perforations 33. This paraffv lin is preferably supplied from a pipe 35, in

which suitable pressure is maintained by any desired means. To relieve the pressure if it accidentally gets toof high, ,I employ a pressure relief valve 36 connected to the pipe 35 and to aretu'rn pipe 37, leading back to the paraflin supply from which the pipe 35 is-supplied. This pipe 35 is preferably of a considerable diameter, and incloses a steam supply pipe 41, which I havey conveniently shown as rising alongside of the paraf'n drain 42, located at one side of the machine. Theypipe 35 extends upward and is connected' by the curved porticnf43 with a the horizontal bearing end 44, which has the lreduced end portion 45 entering the flanged end 46 of the rotating bearing sleeve 47 which forms the axle for that end 6fthe gaging roll '16. The .pipe 35 is provided with the swinging joint connection 48 toy the auxlllary pipe 49 which also has the Vof the gaging roll 17. The steam supply pipe 41 extends upward through the pipe 35, and also has a right angle bend-in thecurve 43 and has its lhorizontal extension 53 extending substantially to the other end of the center of the gaging'roll 16, where it is closed, so that the steam can enter the pipe..

53 in the roller and keep its contents liquid, without permitting the water of condensation to escape into the roller and thus mix with the paraffin. The pipe 41 is supplied at the joint 48 with a similar interior jointA 54 so that the roll 17 may be supplied in its interior with a steam pipe 55 corresponding exactly to the pipe 53 of the roll 16.-

The solid axle 19"'is mounted in a stationary bearing 56 formed in the frame, and the hollow axle 52 of the roll 17 is mounted in a similar, but necessarily larger, stationary bearing 57. A packing nut 58 inclosing the v packing 59 and secured on the end ofthe bearing serves. to make the joint liquidtight in spite of the rotation of the roll. The solid axle 18 is mounted in a bearing 60 sliding in suitable horizontal waysl formed in that side ofthe frame 10, while the hollow bearing 47 is journaled in a similar movable bearing 61 mounted in vcorresponding ways in that end of the frame; The two rolls 16 and 17 are urged apart with, the desired adjustable forcel' by means of the pair of helically coiled expanding springs 62 at either end surrounding the lugs 63 formed on the bearings 56v and "57, and having their .other ends preferably located in recesses 64 formed in the movable bearings 60 and 61, which movable bearings have on the other side the lugs 65 opposed to the ends 66 of the set screws '67 which are threaded through lugs 68 formed on the framework 10. The ends of the set screws 67 .are provided with the collars 69 secured thereon which form abutments for the outer ends ofthe helically coiled expanding spring 7.0 surrounding the ends of the set screws andthe lugs 65 and put under the desired tension by the adjustment of the set screws 67. By the arrangement shown, it will be obvious that the pressure between the gaging rolls 16 and 17 canv be adjusted to a nicety so as' to control the amount of paraffin that will be carried off' by lthe blanks rol. s.

rods 73 extending across the machine', and' at their inner ends by the hooked flanges 7 4 tucked under similar spacing rods 75. The

'one end and extendin passing downward between the- As the action of the gaging rolls may de basins are provided with a pair of pipes 7 6 opening into the lowest portion thereof at ward so as to empty into the paraffin drip tank 4 2.

The operation of my improved apparatus will be readily apparent. The machine is run at a constant speed, so that the centrifugal force of the paraffin tending to drive it through the perforations 33 and into the felt 34 will be uniform, and the melted paraffin from the pipe 35 will .flow through the connections described into the hollow` forced toward eachsotherwith some consid-` outward and downerable pressure by the' springs a-s above described. The blanks pass straight down between the rolls and between the pans 71 and are delivered to the engaging angle of the cords 14 and 15 between the rolls 12 and 13, so that the blank thickly coated with hot paraffin is chilled before the kparaffin has time to penetrate the body of the'blank.

I may prevent the paraffin from escaping,

from the angle formed between the rolls at the top by placing at the ends of the rolls the plates 77, which fit over the axles and are secured vin place by the set screws 78 threaded through the frame 10, as clearly shown in Fig. 3.

While I have shown and described my invention as embodied in the form which I at present consider best adapted to carry out its purposes, it will be understood that it is capable of modifications, and that I do not desire to. be limited in the interpretation of the following claimsexcept as may be necessitated by the state of the prior art.

What I claim as new and-desire-to secure by Letters Patent of the United States is:

l. In an apparatus of the class described, the combination with a pair of gaging rolls having perforations in their metallic shells and an external fibrous covering, of a heat-fl ing pipe extending through the axle of each roll at one end, means for pressing said rolls into engagement with each other, means for rotating the rolls, and means for sup-rv having perforations in their metallic shells plying the interior of the rolls with the coatand an external fibrous covering, of paratin dug liquid. supply pipes entering through Athe axles of In an apparatus of the class described, the rolls at one end', heating pipes Within the 20 the combination with a pair of gaging rolls paraffin supply pipes and extending the hhvng perforations in their metallic shells length of the rolls, lmeans for pressing said and an external fibrous covering, of means rolls into engagement with each other, and for-,pressing said rolls into engagement with means for rotating the rolls.

each other, means for rotating the rolls, ln Witness whereof, I have hereunto set 25 means for supplying the interior of the rolls my hand and aflixed my seal, this 31st day with the coating fluid, anda pair of drip ofJuly, A. D.1918.

pans placed beneath the rolls having their adjacent edges separated to form a passage FRANK P' VAVRA' [LS] for the blanks. f Witnesses:

L In an apparatus ofthe class described, C. M. STUMCKE,

the combination with a pair ofgaging rolls JNO. G.'ELL1o'1'r. 

